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denoland-deno/ext/broadcast_channel/lib.rs
Matt Mastracci e55b448730
feat(core) deno_core::extension! macro to simplify extension registration (#18210)
This implements two macros to simplify extension registration and centralize a lot of the boilerplate as a base for future improvements:

* `deno_core::ops!` registers a block of `#[op]`s, optionally with type
parameters, useful for places where we share lists of ops
* `deno_core::extension!` is used to register an extension, and creates
two methods that can be used at runtime/snapshot generation time:
`init_ops` and `init_ops_and_esm`.

---------

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>
2023-03-17 18:22:15 +00:00

130 lines
3 KiB
Rust

// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
mod in_memory_broadcast_channel;
pub use in_memory_broadcast_channel::InMemoryBroadcastChannel;
pub use in_memory_broadcast_channel::InMemoryBroadcastChannelResource;
use std::cell::RefCell;
use std::path::PathBuf;
use std::rc::Rc;
use async_trait::async_trait;
use deno_core::error::AnyError;
use deno_core::op;
use deno_core::OpState;
use deno_core::Resource;
use deno_core::ResourceId;
use deno_core::ZeroCopyBuf;
#[async_trait]
pub trait BroadcastChannel: Clone {
type Resource: Resource;
fn subscribe(&self) -> Result<Self::Resource, AnyError>;
fn unsubscribe(&self, resource: &Self::Resource) -> Result<(), AnyError>;
async fn send(
&self,
resource: &Self::Resource,
name: String,
data: Vec<u8>,
) -> Result<(), AnyError>;
async fn recv(
&self,
resource: &Self::Resource,
) -> Result<Option<Message>, AnyError>;
}
pub type Message = (String, Vec<u8>);
struct Unstable(bool); // --unstable
#[op]
pub fn op_broadcast_subscribe<BC>(
state: &mut OpState,
) -> Result<ResourceId, AnyError>
where
BC: BroadcastChannel + 'static,
{
let unstable = state.borrow::<Unstable>().0;
if !unstable {
eprintln!(
"Unstable API 'BroadcastChannel'. The --unstable flag must be provided.",
);
std::process::exit(70);
}
let bc = state.borrow::<BC>();
let resource = bc.subscribe()?;
Ok(state.resource_table.add(resource))
}
#[op]
pub fn op_broadcast_unsubscribe<BC>(
state: &mut OpState,
rid: ResourceId,
) -> Result<(), AnyError>
where
BC: BroadcastChannel + 'static,
{
let resource = state.resource_table.get::<BC::Resource>(rid)?;
let bc = state.borrow::<BC>();
bc.unsubscribe(&resource)
}
#[op]
pub async fn op_broadcast_send<BC>(
state: Rc<RefCell<OpState>>,
rid: ResourceId,
name: String,
buf: ZeroCopyBuf,
) -> Result<(), AnyError>
where
BC: BroadcastChannel + 'static,
{
let resource = state.borrow().resource_table.get::<BC::Resource>(rid)?;
let bc = state.borrow().borrow::<BC>().clone();
bc.send(&resource, name, buf.to_vec()).await
}
#[op]
pub async fn op_broadcast_recv<BC>(
state: Rc<RefCell<OpState>>,
rid: ResourceId,
) -> Result<Option<Message>, AnyError>
where
BC: BroadcastChannel + 'static,
{
let resource = state.borrow().resource_table.get::<BC::Resource>(rid)?;
let bc = state.borrow().borrow::<BC>().clone();
bc.recv(&resource).await
}
deno_core::extension!(deno_broadcast_channel,
deps = [ deno_webidl, deno_web ],
parameters = [BC: BroadcastChannel],
ops = [
op_broadcast_subscribe<BC>,
op_broadcast_unsubscribe<BC>,
op_broadcast_send<BC>,
op_broadcast_recv<BC>,
],
esm = [ "01_broadcast_channel.js" ],
config = {
bc: BC,
unstable: bool,
},
state = |state, bc, unstable| {
state.put(bc);
state.put(Unstable(unstable));
},
);
pub fn get_declaration() -> PathBuf {
PathBuf::from(env!("CARGO_MANIFEST_DIR"))
.join("lib.deno_broadcast_channel.d.ts")
}